topic Getting Selection Area in ArcGIS Pro SDK Questions

Getting Selection Area

RussellSuter — Mon, 17 Apr 2023 15:14:20 GMT

I think I know the answer to this but here goes. What I need (beyond the selected features) is the geometry of the selection area in map coordinates. What I'd like is to simply use what is already provided since that works great:

I see where I can use:

MapSelectionChangedEvent.Subscribe(OnSelectionChanged);

to be notified when the selection is made and I get the features selected:

private void OnSelectionChanged(MapSelectionChangedEventArgs args) { if (args.Map != _activeMap) return; UpdateForActiveMap(false, args.Selection.ToDictionary()); }

With this, I'm not seeing how to get the geometry of the selection area. Is there a way to get the selection area without writing a whole new selection tool ala: FeatureSelectionTool?

Thanks!

Re: Getting Selection Area

Wolf — Mon, 17 Apr 2023 23:57:56 GMT

The input geometry is not passed through to the event handler. You can easily write your own tool by creating a MapTool, then changing the SketchType (Rectangle, Line, Polygon etc.), and adding these lines to the OnSketchCompleteAsync method:

protected override Task<bool> OnSketchCompleteAsync(Geometry geometry) { QueuedTask.Run(() => { var selectionSet = MapView.Active.SelectFeatures(geometry); OnMySelectionEvent(geometry, selectionSet); }); return base.OnSketchCompleteAsync(geometry); }

Now you call your own event handler passing in the selection and the geometry.

Re: Getting Selection Area

RussellSuter — Tue, 18 Apr 2023 14:41:59 GMT

Yes. That's what I expected. It is unfortunate that I need to replicate what is already there and working.